﻿The function gets the set of <i>IfcPropertySetDefinition</i>'s. It iterates through the <i>Name</i> attibute of the <i>IfcPropertySet</i>'s 
and verifies that no <i>Name</i> appears twice. It is called from within the function <i>IfcUniqueDefinitionNames</i>.
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HISTORY&nbsp; New function in IFC4 ADD1
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